Endocrine Disruptors, Gut Microbiota, and Type 2 Diabetes: Bridging Mechanisms to Probiotic-Based Therapeutic...

Genetic and lifestyle factors alone cannot explain the rising global burden of type 2 diabetes mellitus (T2DM). Growing evidence implicates endocrine-disrupting chemicals (EDCs) found in plastics, pesticides, food packaging, industrial products, and contaminated water as significant environmental contributors to metabolic dysfunction. EDCs, including bisphenol A (BPA), phthalates, per- and polyfluoroalkyl substances (PFAS), persistent organic pollutants (POPs), and heavy metals, have been associated with insulin resistance, pancreatic β-cell dysfunction, oxidative stress, mitochondrial impairment, chronic inflammation, and epigenetic modifications that collectively promote T2DM pathogenesis. The gut microbiota has emerged as a potential mediator of EDC-associated metabolic disruption, whereby chemical exposures may alter microbial diversity, disturb the Firmicutes/Bacteroidetes ratio, impair short-chain fatty acid production, decrease intestinal barrier integrity, driving metabolic endotoxemia and systemic inflammation. This narrative review examines the major EDCs associated with diabetes, their molecular and metabolic mechanisms of action, and their interactions with the gut microbiota, drawing on current experimental and epidemiological evidence. Special emphasis is placed on probiotic supplementation as an emerging therapeutic strategy targeting the EDC-gut microbiota-metabolic axis. Current evidence for probiotics in EDC-associated metabolic dysfunction is predominantly preclinical, with studies suggesting improvements in microbial homeostasis, pancreatic oxidative damage, and glucose metabolism. However, available evidence remains heterogeneous and human clinical trials specifically examining probiotic intervention in EDC-exposed populations at risk of T2DM remain absent, representing a fundamental translational gap that future research must urgently address. Advancing precision medicine approaches, integrating microbiome profiling, metabolomics, epigenetic analysis, and coordinated efforts across toxicology, clinical medicine, and public health, will be essential to reducing the growing global burden of environmentally driven type 2 diabetes.